You really should check out that Stoetkit, if you haven't already. Heart makes their own transformers and chassis, and I understand they make them as an OEM for a lot of other manufacturer's too. So that lets them bring a top-notch product to the market at an entry-level price.Also, Douglas (Tnuctipun), here and over in the Group Build forum, has contacts with another transformer winder. I don't know much about the details, but I understand that the quality is very good.